.sudoku-grid{display:grid;gap:2px;margin:0 auto 2rem;padding:1rem;background:var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-medium)}.sudoku-grid.mini{grid-template-columns:repeat(2,1fr);max-width:200px}.sudoku-grid.easy{grid-template-columns:repeat(4,1fr);max-width:300px}.sudoku-grid.hard,.sudoku-grid.medium{grid-template-columns:repeat(9,1fr);max-width:500px}.sudoku-cell{aspect-ratio:1;background:var(--bg-primary);border:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:700;cursor:pointer;transition:all var(--transition-fast);user-select:none;position:relative}.sudoku-cell:hover{background:var(--bg-secondary)}.sudoku-cell.selected{background:var(--primary-color);color:#fff}.sudoku-cell.given{background:var(--bg-secondary);color:var(--text-primary);cursor:default;font-weight:900}.sudoku-cell.given:hover{background:var(--bg-secondary)}.sudoku-cell.error{background:#fee2e2;color:#dc2626}.sudoku-cell.highlighted{background:#ddd6fe;color:var(--text-primary)}.sudoku-cell input{width:100%;height:100%;border:none;background:0 0;text-align:center;font-size:inherit;font-weight:inherit;color:inherit;outline:0}.sudoku-grid.hard .sudoku-cell:nth-child(3n),.sudoku-grid.hard .sudoku-cell:nth-child(6n),.sudoku-grid.medium .sudoku-cell:nth-child(3n),.sudoku-grid.medium .sudoku-cell:nth-child(6n){border-right:3px solid var(--border-color)}.sudoku-grid.hard .sudoku-cell:nth-child(n+19):nth-child(-n+27),.sudoku-grid.hard .sudoku-cell:nth-child(n+46):nth-child(-n+54),.sudoku-grid.medium .sudoku-cell:nth-child(n+19):nth-child(-n+27),.sudoku-grid.medium .sudoku-cell:nth-child(n+46):nth-child(-n+54){border-bottom:3px solid var(--border-color)}.number-buttons{display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem;margin:1rem 0}.number-btn{width:40px;height:40px;border:2px solid var(--border-color);background:var(--bg-primary);color:var(--text-primary);border-radius:var(--radius-md);font-size:1.1rem;font-weight:700;cursor:pointer;transition:all var(--transition-fast)}.number-btn.active,.number-btn:hover{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.high-scores-list{max-height:200px;overflow-y:auto}.score-item{display:flex;justify-content:space-between;align-items:center;padding:.5rem;border-bottom:1px solid var(--border-color)}.score-item:last-child{border-bottom:none}.score-rank{font-weight:700;color:var(--primary-color)}.score-details{display:flex;gap:1rem;font-size:.875rem;color:var(--text-secondary)}#final-stats{background:var(--bg-secondary);padding:1rem;border-radius:var(--radius-md)}.gap-md{gap:var(--spacing-md)}.justify-center{justify-content:center}@media (max-width:768px){.sudoku-grid{max-width:90vw;padding:.5rem}.sudoku-cell{font-size:1rem}.game-score{font-size:.875rem}.number-btn{width:35px;height:35px;font-size:1rem}}@media (max-width:480px){.sudoku-cell{font-size:.9rem}.sudoku-grid{gap:1px}.number-btn{width:30px;height:30px;font-size:.9rem}}